Method for the calibration of a top drive and top drive for a drill string
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United States of America Patent
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Sep 29, 2020
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N/A
app pub date -
Jun 5, 2018
filing date -
Jun 5, 2018
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Abstract
A top drive for a drill string, and an apparatus and method for calibrating the top drive. The top drive includes a rotationally driven shaft that is rotatably mounted by a bearing arrangement having at least one axial bearing and at least one load measuring cell for measuring an axial load of the at least one axial bearing. A calibration device including a pressure element is placed at an upper end portion of the drive shaft. The pressure element exerts a defined calibration force onto the drive shaft in an axial direction. The at least one load measuring cell measures the axial load and transmits a measured load value to a comparing unit, which compares the measured load value with the defined calibration force to determine a differential value. The differential value is then used to calibrate the at least one load measuring cell.
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